CN103994785A - Sensing monitoring device and method based on weak fiber bragg grating array - Google Patents

Sensing monitoring device and method based on weak fiber bragg grating array Download PDF

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CN103994785A
CN103994785A CN 201410232267 CN201410232267A CN103994785A CN 103994785 A CN103994785 A CN 103994785A CN 201410232267 CN201410232267 CN 201410232267 CN 201410232267 A CN201410232267 A CN 201410232267A CN 103994785 A CN103994785 A CN 103994785A
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bragg
fiber
grating
sensing
weak
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CN103994785B (en )
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姜德生
许儒泉
程乘
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武汉理工大学
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Abstract

The invention provides a sensing monitoring device and method based on a weak fiber bragg grating array in order to solve the problems of large crosstalk noise between fiber bragg grating sensors, complex network structure and high system manufacturing cost of the existing fiber bragg grating sensing network technology. By controlling a pulse width of an input optical pulse, time duration of the optical pulse is larger than that of light reflection between two adjacent gratings in the weak fiber bragg grating array, forwardly-transmitted light interferes with reflected light between the two adjacent fiber bragg gratings, the system inquires an interference signal accurately to complete addressing and monitoring on the weak fiber bragg grating array, therefore, a signal to noise ratio between the fiber bragg grating sensors is increased, the sensing network structure is simplified, and cost is reduced.

Description

一种基于弱光纤光栅阵列的传感监测装置和传感方法 And sensing means sensing the monitoring method based on a weak FBG array

技术领域 FIELD

[0001] 本发明属于传感监测技术领域,具体涉及一种基于弱光纤光栅阵列的传感监测装置和方法。 [0001] The present invention belongs to the technical field sensor monitoring, particularly relates to a sensing apparatus and method based on monitoring the weak FBG array.

背景技术 Background technique

[0002] 光纤传感器具有质量轻、耐高温、耐腐蚀、抗电磁干扰、现场无源等优点,能工作在高温高压、火灾等一般人无法到达的环境,比传统电类传感器具有更广阔的应用前景。 [0002] optical fiber sensor having a light weight, high temperature, corrosion, resistance to electromagnetic interference, a passive field, etc., most people work in high temperature and pressure, can not reach the fire environment, has broad application prospects than conventional electrical type sensor .

[0003]目前光纤光栅传感监测技术中所使用的匹配光纤光栅与传感光栅比较标定的方法,这种方法受到匹配光栅与传感光栅实际制造中工艺差别的限制,光纤光栅传感器之间的串扰噪声较大,另外,传感网络复杂,系统造价昂贵。 [0003] Current methods to match the grating FBG sensing fiber calibrated comparison Grating Sensor used, this method is limited by the actual matching process for producing raster difference in the sensing grating, between the FBG sensors crosstalk noise is large, Furthermore, the sensor network complex, expensive systems. 同时其他通过弱光栅串联成网的方法,网络规模受到光栅反射率的限制,但弱光栅反射率过弱又会造成传感信号不强,对信号的探测与解调造成极大的难度。 While the other series by the weak grating-laid method, network size is limited by the grating reflectivity, the reflectivity of the grating is weak too weak will cause the sensor signal is not strong, causing great difficulty in the detection and demodulation of the signal. 综上所述,现有光纤光栅传感网络技术中存在的光纤光栅传感器之间的串扰噪声较大、网络结构复杂、系统造价昂贵的缺点,限制了传感网络规模的发展。 As described above, crosstalk noise between the fiber Bragg grating FBG sensor network prior art that a large, complex network structure, the system costly drawbacks, limiting the development of network scale sensor.

发明内容 SUMMARY

[0004] 为解决现有光纤光栅传感网络技术中存在的光纤光栅传感器之间的串扰噪声较大、网络结构复杂、系统造价昂贵的缺点,本发明提供一种基于弱光纤光栅阵列的传感监测装置,实现提高光纤光栅传感器之间信噪比,简化传感网络结构,降低成本的目的。 [0004] In order to solve the conventional FBG sensor network technology exist in large crosstalk noise between the FBG sensor, complex network structure, the system costly drawbacks, the present invention provides a fiber Bragg grating-based sensor arrays weak monitoring means, improved signal to noise ratio between the fiber Bragg grating sensor, the sensing simplified network structure, reduce cost.

[0005] 为了达到上述发明目的,本发明采取以下技术方案: [0005] In order to achieve the above object, the present invention adopts the following technical scheme:

[0006] 提供一种基于弱光纤光栅阵列的传感监测装置,包括, [0006] to provide a monitoring device based on a weak FBG sensor array, comprising,

[0007] 光源模块,用于提供相干脉冲光,其脉冲宽度长于弱光纤光栅阵列中相邻两个光纤光栅之间反射所需时间;弱光纤光栅阵列,接收光源模块发出的相干脉冲光,在弱光纤光栅阵列中相邻两个光纤光栅之间的反射光之间发生干涉;光电探测器,置于弱光纤光栅阵列的输出端,探测该干涉信号并传送到控制器;控制器,与光电探测器相连接,用于采集该干涉信号,并对产生该干涉信号的光纤光栅传感器件进行查询。 [0007] The light source module for providing a coherent pulsed light having a pulse width longer than the time required between two adjacent reflective fiber gratings FBG array weak; weak fiber grating array, receiving coherent pulsed light emitted from the light source module, in interference occurs between the reflected light between the two fiber gratings FBG arrays adjacent weak; photodetectors, placed on the output side weak FBG array, and the detection of the interference signal to the controller; a controller, photoelectric detector is connected, for acquiring the interference signal, and generates the FBG sensor device query signal interference.

[0008] 所述弱光纤光栅阵列为光纤布拉格光栅阵列。 [0008] The weak fiber grating is a fiber Bragg grating array of arrays.

[0009] 所述光源模块包括发出相干激光的光源,及在所述光源后设置的光开关,由所述控制器中的脉冲发生器发出电时序信号,脉冲发生器与光开关连接,对光开关进行控制。 [0009] The light source module includes a coherent laser light source, and an optical switch disposed after the light source, emits an electrical signal generated by said timing pulse generator controller, pulse generator connected to the optical switch, the optical switch control. 所述光源为单波长相干激光光源或多波长相干激光光源。 The light source is a single-wavelength or multi-wavelength coherent laser source of coherent laser light source.

[0010] 为对相干脉冲光进行放大,在所述光开关与所述弱光纤光栅阵列之间设置光放大器,对进入弱光纤光栅阵列之前的相干脉冲光进行放大。 [0010] The coherent pulsed light is amplified, coherent weak pulse before it enters the optical fiber grating array amplifies the optical switch with optical amplifier disposed between said low fiber grating arrays.

[0011] 所述光放大器和弱光纤光栅阵列之间还设置有一个3端口光环行器,所述光放大器的输出端连接光环行器的I端口,光环行器的2端口连接弱光纤光栅阵列,光环行器的3端口连接所述光电探测器。 [0011] further provided between the optical amplifiers and fiber grating array has a weak three-port optical circulator, a second port connected to an output terminal of said optical amplifier connected to the I-port optical circulator, the optical circulator weak FBG array , 3-port optical circulator is connected to the photodetector.

[0012] 在所述光电探测器输出端和所述控制器的输入端之间还设置有低通滤波器,光电探测器的输出端与低通滤波器的输入端相连接,低通滤波器的输出端与控制器的输入端相连接。 [0012] between said photodetector output and the input of the controller is further provided with a low-pass filter, the output of the photodetector input end of the low-pass filter is connected, a low pass filter the input terminal is connected to the output terminal of the controller.

[0013] 控制器中还设置有数模采集卡,对电信号进行采集。 [0013] The controller is also provided with several mold capture card, the electrical signal acquisition.

[0014] 本发明基于弱光纤光栅阵列的传感监测装置原理为:相干光源经过光开关后被调制为相干脉冲光,光开关由脉冲发生器发出的电时序信号所控制,脉冲发生器由所述控制器进行控制。 [0014] The principles of the present invention is a weak FBG sensor array monitoring device is based on: a coherent light source through an optical switch after being modulated coherent pulsed light, electric light switch timing signal emitted by the pulse generator is controlled by a pulse generator that said controller controls. 经过光开关后的相干脉冲被光放大器放大,继而进入光环行器的I端口,从I端口进入的光信号,由光环行器的2端口输出,输入弱光纤光栅阵列,光信号在弱光纤光栅阵列中各相邻2个光纤光栅之间进行反射光干涉后,干涉信号从光环行器的3端口输出,进入光电探测器,光信号转换为电信号,光电探测器的输出端连接低通滤波器的输入端,被低通滤波器滤波后,信号进入控制器,所述信号由控制器中的数模采集卡所采集,并进行处理,对产生该干涉信号的光纤光栅传感器件进行查询,具体为通过采集不同时间的干涉信号,对光纤光栅阵列传感器件进行地址查询及光波长信息的查询。 After coherent pulses of the optical switch is amplified by an optical amplifier, then enter optical circulator I port, an optical signal I port access from the 2-port output optical circulator input weak fiber grating array, the optical signal is weak FBG after the array of adjacent two interference between the reflected light grating, the interference signal output from the third port of the optical circulator into a photodetector, an optical signal into an electrical signal, the output of the photodetector is connected to the low pass filter input of the filter, after being low-pass filter, the signal enters the controller, the signal acquired by a digital to analog controller grabber and processed, the generation of the interference signal FBG sensor device query, specifically, an array of FBG sensor device query address inquiries and information by interference light having a wavelength different from the signal acquisition time.

[0015] 本发明还提供一种基于弱光纤光栅阵列的传感监测方法,包括: [0015] The present invention also provides a monitoring method based on sensing the weak FBG array, comprising:

[0016] 对入射到弱光纤光栅阵列中的相干脉冲光的脉冲宽度进行控制,使该脉冲宽度长于光在相邻两个光纤光栅之间反射所需时间;相邻两个光纤光栅的反射光之间发生干涉,该干涉信号通过光电探测器传送到控制器;控制器采集该干涉信号,并对产生该干涉信号的光纤光栅传感器件进行查询。 [0016] The pulse width of the incident weak coherent pulsed light FBG array controlled so that the pulse width is longer than the time required between two adjacent FBG reflected light; reflected light adjacent two fiber gratings interference between the interference signal to the controller by the photodetector; controller collects the interference signal, and generates the FBG sensor device query signal interference.

[0017] 如需对第i个和第i + Ι个光纤光栅干涉信号进行查询,即需要采集时间为 [0017] To query the interference signal of the i-th and i + Ι FBG, i.e. acquisition time is required

Figure CN103994785AD00041

的反射光的干涉信号,其中ALi是第i个光栅和第i+Ι个光栅之间的间 The interference signal of the reflected light, wherein ALi is the spacing between the i th and the i + Ι raster grating

距。 distance. 这个干涉信号包括了前后两个相邻光纤光栅反射光的干涉信号,通过后续的数据处理可以分析传感器所感知的环境参数的变化。 The interference signal comprising interference signals of the front and rear two adjacent FBG reflected light, the sensor may be analyzed variations perceived environmental parameters by subsequent data processing.

[0018] 其中经过光开关调制得到的相干脉冲光,第i个光脉冲的脉冲宽度应为:.η@Α:,其中弱光纤光栅阵列中第i个光栅和第i+Ι个相邻光栅的间距为ALi,neff为光纤的有效折射率,c为真空中的光速。 [0018] wherein after coherent pulsed light obtained by modulating switch, i-th pulse width of the light pulse should be: .η @ Α :, weak fiber grating array wherein the i-th and the i + Ι raster adjacent raster the pitch ALi, neff is the effective refractive index of the optical fiber, c is the light velocity in vacuum.

[0019] 所述对光纤光栅传感器件进行查询具体包括,通过采集不同时间的干涉信号,对光纤光栅阵列传感器件进行地址查询及光波长信息的查询。 [0019] The query FBG sensor device comprises, on the FBG sensor array device address query and query information by interference light having a wavelength different from the signal acquisition time.

[0020] 本发明的有益效果为:实现提高光纤光栅传感器之间信噪比,简化传感网络结构,降低成本的目的。 [0020] Advantageous effects of the present invention are: improved signal to noise ratio between the FBG sensors, sensor networks simplified configuration and cost reduction purposes.

附图说明 BRIEF DESCRIPTION

[0021] 图1是本发明装置的结构示意图。 [0021] FIG. 1 is a schematic view of the apparatus of the present invention.

具体实施方式 detailed description

[0022] 为使本发明的上述目的、特征和优点能够更加明显易懂,下面结合附图对本发明的具体实施例作进一步详细描述: [0022] For the above-described objects, features and advantages of the invention more apparent, the following embodiments in conjunction with the accompanying drawings of specific embodiments of the present invention will be described in further detail:

[0023] 如附图所示,本发明提供的一种基于弱光纤光栅阵列的传感监测装置,包括,光源模块,用于提供相干脉冲光,其脉冲宽度长于弱光纤光栅阵列中相邻两个光纤光栅之间反射所需时间;弱光纤光栅阵列,接收光源模块发出的相干脉冲光,在弱光纤光栅阵列中相邻两个光纤光栅之间的反射光之间发生干涉;光电探测器,置于弱光纤光栅阵列的输出端,探测该干涉信号并传送到控制器;控制器,与光电探测器相连接,用于采集该干涉信号,并对产生该干涉信号的光纤光栅传感器件进行查询。 [0023] As shown in the drawings, the present invention provides one kind of sensor-based monitoring apparatus weak FBG array comprising, a light source module for providing a coherent pulsed light having a pulse width longer than the weak fiber array adjacent two grating between the optical fiber grating reflects the time required; interference between the reflected light between the two fiber gratings weak fiber grating array, receiving coherent pulsed light emitted from the light source module, adjacent weak FBG array; photodetectors, weak FBG is placed in the output of the array, and the detection of the interference signal to the controller; a controller, connected to the photodetector for collecting the interference signal, and generating the interference of the fiber grating sensor device query signal .

[0024] 所述弱光纤光栅阵列为光纤布拉格光栅阵列。 [0024] The weak fiber grating is a fiber Bragg grating array of arrays. 本发明实施例中,弱光栅阵列是由多个具有极低反射率的光纤布喇格光栅组成,其中光栅的反射率在0.1〜1%。 Embodiments of the present invention, the weak grating is an optical fiber array by a plurality of Bragg grating having a very low reflectance composition, wherein the reflectance of the grating at 0.1~1%. 量级,波长范围在光源的波长范围内。 The order of the wavelength range in the wavelength range of the light source.

[0025] 所述光源模块包括发出相干激光的光源,及在所述光源后设置的光开关,由所述控制器中的脉冲发生器发出电时序信号,脉冲发生器与光开关连接,对光开关进行控制。 [0025] The light source module includes a coherent laser light source, and an optical switch disposed after the light source, emits an electrical signal generated by said timing pulse generator controller, pulse generator connected to the optical switch, the optical switch control. 所述光源为单波长相干激光光源或多波长相干激光光源。 The light source is a single-wavelength or multi-wavelength coherent laser source of coherent laser light source. 本发明实施例中,光源使用相干梳状光源。 Embodiment, the coherent light source using a light source of the present invention a comb.

[0026] 本发明实施例中,光开关采用SOA光开关。 Embodiment [0026] of the present invention, an optical switch using an optical switch SOA. 还可以使用基于AOM的光开关或基于EAM的光开关或者EOM光开关。 Or an optical switch may also be used EOM EAM based optical switch or an optical switch based on the AOM. 光开关受到控制器的控制,控制输入光脉冲的时间长度,使得光脉冲的持续时间大于相邻两个光栅之间的反射的长度,则相邻两个光栅的反射信号形成干涉。 An optical switch controlled by the controller, the length of time the control input optical pulse, so that the duration of the light pulse is greater than the length of the reflector between the adjacent two gratings, the two gratings is reflected signals formed adjacent interference.

[0027] 为对相干脉冲光进行放大,在所述光开关与所述弱光纤光栅阵列之间设置光放大器,对进入弱光纤光栅阵列之前的相干脉冲光进行放大。 [0027] The coherent pulsed light is amplified, coherent weak pulse before it enters the optical fiber grating array amplifies the optical switch with optical amplifier disposed between said low fiber grating arrays.

[0028] 本发明实施例中,光放大器使用掺铒光纤放大器。 Embodiment, the optical amplifier using erbium doped fiber amplifier [0028] embodiment of the present invention. 或者根据工作波长的需要,也可以采用掺镨光纤放大器,或者通过半导体光放大器实现。 Or the operating wavelength as desired, may be employed praseodymium-doped fiber amplifier, or implemented by a semiconductor optical amplifier.

[0029] 所述光放大器和弱光纤光栅阵列之间还设置有一个3端口光环行器,所述光放大器的输出端连接光环行器的I端口,光环行器的2端口连接弱光纤光栅阵列,光环行器的3端口连接所述光电探测器。 [0029] further provided between the optical amplifiers and fiber grating array has a weak three-port optical circulator, a second port connected to an output terminal of said optical amplifier connected to the I-port optical circulator, the optical circulator weak FBG array , 3-port optical circulator is connected to the photodetector.

[0030] 在所述光电探测器输出端和所述控制器的输入端之间还设置有低通滤波器,光电探测器的输出端与低通滤波器的输入端相连接,低通滤波器的输出端与控制器的输入端相连接。 [0030] between said photodetector output and the input of the controller is further provided with a low-pass filter, the output of the photodetector input end of the low-pass filter is connected, a low pass filter the input terminal is connected to the output terminal of the controller.

[0031 ] 控制器中还设置有数模采集卡,对光电探测器输出的电信号进行采集。 [0031] The controller is also provided with several mold capture card, the electrical signal output by the photodetector is collected.

[0032] 本发明还提供一种基于弱光纤光栅阵列的传感监测方法,包括: [0032] The present invention also provides a monitoring method based on sensing the weak FBG array, comprising:

[0033] 对入射到弱光纤光栅阵列中的相干脉冲光的脉冲宽度进行控制,使该脉冲宽度长于光在相邻两个光纤光栅之间反射所需时间;相邻两个光纤光栅之间的反射光之间发生干涉,该干涉信号通过光电探测器传送到控制器;控制器采集该干涉信号,并对产生该干涉信号的光纤光栅传感器件进行查询。 [0033] The pulse width of the incident weak coherent pulsed light fiber grating array is controlled so that the pulse width is longer than the time required between two adjacent FBG reflected light; between two adjacent fiber Bragg grating interference between the reflected light, the interference signal to the controller by the photodetector; controller collects the interference signal, and generates the FBG sensor device query signal interference.

[0034] 本发明实施例中,弱光栅阵列是由多个具有极低反射率的光纤布喇格光栅组成,光源模块包括发出连续相干光的相干梳状光源,及在所述光源后设置的光开关,由所述控制器中的脉冲发生器发出电时序信号,对光开关进行控制,光开关采用SOA光开关。 [0034] The embodiments of the present invention, the weak grating is an optical fiber array by a plurality of Bragg grating having a very low reflectance composition, emits a coherent light source module includes a comb continuous coherent light source and the light source is provided in the light switches, electrical timing signal emitted by the pulse generator controller, controls the optical switch, an optical switch using an optical switch SOA. 光开关受到控制器的控制,控制输入光脉冲的时间长度,使得光脉冲的持续时间大于光相邻两个光栅之间的反射的长度,则相邻两个光栅的反射信号形成干涉。 An optical switch controlled by the controller, the length of time the control input optical pulse, so that the duration of the light pulse reflected by a length greater than between two adjacent light gratings, the two gratings is a reflection signal formed adjacent interference. 在光开关与所述弱光纤光栅阵列之间设置掺铒光纤放大器,光放大器和弱光纤光栅阵列之间还设置有一个3端口光环形器,所述光放大器连接光环行器的I号端口,光环行器的2号端口连接弱光纤光栅阵列,光环行器的3端口连接所述光电探测器。 Weak optical switch disposed between the erbium doped fiber grating array is also provided with a 3-port optical circulator between the optical fiber amplifiers, optical amplifiers and fiber grating array is weak, the optical amplifier connected to port I, optical circulator, port 2 of optical circulator is connected to a weak FBG array, said photodetector 3 connected to port optical circulator. 光电探测器输出端和所述控制模块的输入端之间还设置有低通滤波器。 It is also provided with a low-pass filter between the photodetector output and input of the control module. 将低于所设频率的信号滤掉。 Signal is lower than the set frequency filtered. 控制器中设置有数模采集卡,对光电探测器输出的电信号进行采集。 The controller module is provided several acquisition card, the electrical signal output by the photodetector is collected.

[0035] 其中经过光开关调制得到的相干脉冲光,第i个光脉冲的脉冲宽度应为: ≥2 Δ Li.rid/c,其中弱光纤光栅阵列每相邻光栅的间距为ALi, neff为光纤的有效折射 [0035] wherein after coherent pulsed light obtained by modulating switch, i-th pulse width of the light pulse should be: ≥2 Δ Li.rid / c, where each adjacent array weak FBG grating pitch ALi, neff is effective refractive optical fiber

率,c为真空中的光速。 Rate, c is the light velocity in vacuum.

[0036] 所述对光纤光栅传感器件进行查询具体包括,通过采集不同时间的干涉信号,对光纤光栅阵列传感器件进行地址查询及光波长信息的查询。 [0036] The query FBG sensor device comprises, on the FBG sensor array device address query and query information by interference light having a wavelength different from the signal acquisition time.

[0037] 本发明提供一种基于弱光纤光栅阵列的传感监测装置和方法,通过控制输入光脉冲的脉冲宽度,使得光脉冲的持续时间大于弱光纤光栅阵列中相邻两个光栅之间光反射的时间长度,相邻两个光纤光栅之间的前向传输光和反射光之间发生干涉,系统对干涉信号进行精确的查询,完成对弱光纤光栅阵列的寻址与监测,进而实现了提高光纤光栅传感器之间信噪比,简化传感网络结构,降低成本的目的。 [0037] The present invention provides an apparatus and method for monitoring an optical fiber sensor array based on weak gratings, by controlling the pulse width of the input optical pulse, so that duration of the light pulse is greater than the weak light between two neighboring gratings FBG arrays the length of time of reflection, interference of adjacent front between the two fiber gratings between the transmission light and the reflected light, the system queries the interference signal accurately complete the addressing and monitoring weak FBG arrays, thus achieving noise ratio between the FBG sensors, sensor simplified network structure, reduce cost.

Claims (10)

  1. 1.一种基于弱光纤光栅阵列的传感监测装置,其特征在于,包括: 光源模块,用于提供相干脉冲光,其脉冲宽度长于弱光纤光栅阵列中相邻两个光纤光栅之间反射所需时间; 弱光纤光栅阵列,接收光源模块发出的相干脉冲光,在弱光纤光栅阵列中相邻两个光纤光栅之间的反射光之间发生干涉; 光电探测器,置于弱光纤光栅阵列的输出端,探测该干涉信号并传送到控制器;控制器,与光电探测器相连接,用于采集该干涉信号,并对产生该干涉信号的光纤光栅传感器件进行查询。 1. Based on a weak FBG sensor array monitoring device, wherein, comprising: a light source module for providing a coherent pulsed light having a pulse width longer than the reflections between two adjacent fiber Bragg grating FBG array Weak the time required; weak fiber grating array, interference between the reflected light between the two fiber gratings receiving coherent pulsed light emitted from the light source module, adjacent weak FBG array; a photodetector array placed weak FBG an output terminal, and the detection of the interference signal to the controller; a controller, connected to the photodetector for collecting the interference signal, and generates the FBG sensor device query signal interference.
  2. 2.根据权利要求1所述的基于弱光纤光栅阵列的传感监测装置,其特在于,所述弱光纤光栅阵列为光纤布拉格光栅阵列。 The sensor monitoring apparatus based on a weak FBG array according to claim 1, wherein Laid which the weak fiber grating is a fiber Bragg grating array of arrays.
  3. 3.根据权利要求1所述的基于弱光纤光栅阵列的传感监测装置,其特征在于,所述光源模块包括发出相干激光的光源,及在所述光源后设置的光开关,由所述控制器中的脉冲发生器发出电时序信号,脉冲发生器与光开关连接,对光开关进行控制。 The sensor monitoring apparatus based on a weak FBG array according to claim 1, characterized in that the light source module comprises a light source emits a coherent laser beam, and an optical switch disposed after the light source, controlled by the the pulse generator emits an electrical timing signal, a pulse generator connected to the optical switch, the optical switch is controlled.
  4. 4.根据权利要求3所述的基于弱光纤光栅阵列的传感监测装置,其特征在于,所述光源为单波长相干激光光源或多波长相干激光光源。 4. The sensor monitoring apparatus based on a weak FBG array according to claim 3, characterized in that the light source is a single-wavelength or multi-wavelength coherent laser source of coherent laser light source.
  5. 5.根据权利要求4所述的基于弱光纤光栅阵列的传感监测装置,其特征在于,还包括光放大器,设置于所述光开关与所述弱光纤光栅阵列之间,对进入弱光纤光栅阵列之前的相干脉冲光进行放大。 The sensor monitoring apparatus based on a weak FBG array according to claim 4, characterized by further comprising an optical amplifier disposed between the optical switch and the optical fiber grating array weak, weak FBG entering before the array of coherent pulsed light is amplified.
  6. 6.根据权利要求5所述的基于弱光纤光栅阵列的传感监测装置,其特征在于,所述光放大器和弱光纤光栅阵列之间还设置有一个3端口光环行器,所述光放大器的输出端连接光环行器的I端口,光环行器的2端口连接弱光纤光栅阵列,光环行器的3端口连接所述光电探测器。 The sensor monitoring apparatus based on a weak FBG array according to claim 5, wherein there is further provided a 3-port optical circulator between the optical amplifier and fiber grating array is weak, the optical amplifier port 2 weak FBG array connected, I-port optical circulator, the optical circulator connected to the output of the three-port optical circulator is connected to the photodetector.
  7. 7.根据权利要求1所述的基于弱光纤光栅阵列的传感监测装置,其特征在于,在所述光电探测器输出端和所述控制器的输入端之间还设置有低通滤波器,光电探测器的输出端与低通滤波器的输入端相连接,低通滤波器的输出端与控制器的输入端相连接。 The sensor monitoring apparatus based on a weak FBG array according to claim 1, wherein the further low-pass filter provided between said photodetector output and the input of the controller, the output of the photodetector and the input terminal of the low pass filter is connected to the input terminal of the low pass filter output terminal is connected with the controller.
  8. 8.一种基于弱光纤光栅阵列的传感监测方法,其特征在于,包括: 对入射到弱光纤光栅阵列中的相干脉冲光的脉冲宽度进行控制,使该脉冲宽度长于光在任一相邻两个光纤光栅之间反射所需时间; 相邻两个光纤光栅之间的反射光之间发生干涉,该干涉信号通过光电探测器传送到控制器; 控制器采集该干涉信号,并对产生该干涉信号的光纤光栅传感器件进行查询。 A monitoring method based on a weak FBG sensing array, characterized by comprising: a pulse width of the incident light is weak coherent pulsed fiber grating array is controlled so that the pulse width is longer than any of the adjacent two light the time required between the optical fiber reflective grating; between the reflected light between the two adjacent fiber gratings interfere, the interference signal to the controller by the photodetector; controller collects the interference signal, and generating the interference FBG sensor device query signal.
  9. 9.根据权利要求8所述的基于弱光纤光栅阵列的传感监测方法,其特征在于,经过光开关调制得到的相干脉冲光,第i个光脉冲的脉冲宽度应为4≥2ALi.nrff/c,其中弱光纤光栅阵列中第i个光栅与第i+Ι个光栅的间距为ALi, neff为光纤的有效折射率,c为真空中的光速。 9. The monitoring method according to claim weak FBG sensor array based on 8 wherein said coherent pulsed light through the light modulation obtained switch, i-th pulse width of the light pulse should be 4≥2ALi.nrff / c, where a weak FBG i-th array pitch of the grating and the grating i + Ι is ALi, neff is the effective refractive index of the optical fiber, c is the light velocity in vacuum.
  10. 10.根据权利要求9所述的基于弱光纤光栅阵列的传感监测方法,其特征在于,所述对光纤光栅传感器件进行查询具体包括,通过采集不同时间的干涉信号,对光纤光栅阵列传感器件进行地址查询及光波长信息的查询。 10. The sensor monitoring method based on the weak FBG array according to claim 9, wherein the query of the sensor member comprises a fiber grating, an interference signal acquired by different times, FBG array sensor member address inquiries and queries optical wavelength information.
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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105157812A (en) * 2015-09-18 2015-12-16 南京派光信息技术有限公司 Digital enhanced interference-based high-sensitivity quasi-distributed fiber bragg grating vibration sensor
CN105547455A (en) * 2015-12-12 2016-05-04 武汉理工大学 Vibration sensing optical cable and use method thereof
CN106125064A (en) * 2015-05-07 2016-11-16 通用汽车环球科技运作有限责任公司 Spatio-temporal scanning patterns for array lidar systems

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5684297A (en) * 1994-11-17 1997-11-04 Alcatel Cable Method of detecting and/or measuring physical magnitudes using a distributed sensor
JP2006030115A (en) * 2004-07-21 2006-02-02 Ono Sokki Co Ltd Linear encoder
CN102506916A (en) * 2011-11-22 2012-06-20 武汉邮电科学研究院 Distributed sensor network using weak reflection fiber Bragg grating (FBG) and precise positioning method of each FBG
CN102706437A (en) * 2012-06-13 2012-10-03 扬州森斯光电科技有限公司 Super-long distance phase-sensitive optical time domain reflectometer (Phi-OTDR) system
CN102901525A (en) * 2012-10-15 2013-01-30 武汉理工大学 Ultra-large capacity time division and wavelength division fiber grating sensing system and query method thereof
CN102914321A (en) * 2012-10-15 2013-02-06 武汉理工大学 Ultra-low fiber bragg grating sensing system and query method thereof
CN103471812A (en) * 2013-07-15 2013-12-25 武汉理工大学 Weak-grating detection device and detection method thereof

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5684297A (en) * 1994-11-17 1997-11-04 Alcatel Cable Method of detecting and/or measuring physical magnitudes using a distributed sensor
JP2006030115A (en) * 2004-07-21 2006-02-02 Ono Sokki Co Ltd Linear encoder
CN102506916A (en) * 2011-11-22 2012-06-20 武汉邮电科学研究院 Distributed sensor network using weak reflection fiber Bragg grating (FBG) and precise positioning method of each FBG
CN102706437A (en) * 2012-06-13 2012-10-03 扬州森斯光电科技有限公司 Super-long distance phase-sensitive optical time domain reflectometer (Phi-OTDR) system
CN102901525A (en) * 2012-10-15 2013-01-30 武汉理工大学 Ultra-large capacity time division and wavelength division fiber grating sensing system and query method thereof
CN102914321A (en) * 2012-10-15 2013-02-06 武汉理工大学 Ultra-low fiber bragg grating sensing system and query method thereof
CN103471812A (en) * 2013-07-15 2013-12-25 武汉理工大学 Weak-grating detection device and detection method thereof

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106125064A (en) * 2015-05-07 2016-11-16 通用汽车环球科技运作有限责任公司 Spatio-temporal scanning patterns for array lidar systems
CN105157812A (en) * 2015-09-18 2015-12-16 南京派光信息技术有限公司 Digital enhanced interference-based high-sensitivity quasi-distributed fiber bragg grating vibration sensor
CN105547455A (en) * 2015-12-12 2016-05-04 武汉理工大学 Vibration sensing optical cable and use method thereof

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